code: def test_as_tensor_just_returns_value(self):
      for value in [True, 3.234, "this is a string"]:
          assert FlagField(value).as_tensor({}) == value
  
file_path: allennlp/tests/data/fields/flag_field_test.py
imports: import pytest
  from allennlp.common.testing.test_case import AllenNlpTestCase
  from allennlp.data.fields import FlagField
label_desc: Use image node_id 2 for calling the TestFlagField obj's underlying member method code with example usage: obj.test_as_tensor_just_returns_value() without return types